You know Filoni is going to try to get Ashoka and probably Plo Koon in there somewhere!
I mentioned Plo Koon in the Rebels thread, assuming the character would show up because he's Filoni's favorite. DarthSkywalker then reminded me 'Koon was killed during Episode III as part of Order 66. Bummer! Given the way he died I think it's unlikely we'll be seeing him again, I'm holding out hope for Ahsoka though!